What is the definition of "Ir Chomah"?
Rashi: It is a town that had a surrounding wall from the days of Yehoshua bin Nun. 1
At the time of conquest (See Sifsei Chachamim).
What distinction does the Pasuk draw between the sale of a field and the sale of a house in a walled town?
Rashi: Whereas the former may redeem his field after two years, the latter may only redeem his house during the first year, but not afterwards.
Why does the Torah add the 'Vav' at the end of "Sh'nas Mimkaro"?
Targum Onkelos and Targum Yonasan: It implies a full year from day to day, and not until the end of the year (Erev Rosh ha'Shanah). 1
Da'as Zekenim: This Parshah alludes to Hashem, who 'sold' Eretz Yisrael to Bavel for 70 years (due to the 70 Shemitah years that were not observed). At the end of this time, He will redeem the sale (return the land to Yisrael).
Torah Temimah (citing Erchin, 18b): Because it implies "Mimkaro", 've'Lo Shanah shel Minyan' Olam'.
What is the meaning of "Yamim" (on its own)?
Why does a house in a walled town not revert to the seller in Yovel, like a field does? The Torah gave greater redemption rights for a house, i.e. he can redeem within one year!
Refer to 25:28:3:1.